Thanks, Donald. Does help.
But, I've not seen any labeling that indicate 'bi-pin' or otherwise
(doesn't mean it wasn't there but I missed it). Do you just have to
inspect before buying, or trust the photos on the website? These days
most show lumens, and color--as 'heat' in degrees Kelvin--and, usually,
voltage, but no 'formal' designation; maybe like 'T12BPNS' ('1.5 inches
diameter, Bi-Pin Narrow Spacing')?
On 1/11/2022 9:13 AM, Donald H Locker wrote:
> [I'd intended to reply to the list and clicked the wrong button. Here it
> is again, Bob.]
>
> If you have "tombstones" (the end fittings into which the tubes are
> plugged) that are for two-prongs (called "bi-pin") you'll have to get
> the bi-pin tubes to fit. The single-post tombstones are completely
> different, as are the tubes.
>
> Be aware that T12 (1.5in diameter tubes) and most T8 (1.0in diameter
> tubes) commonly use "medium bi-pin" spacing, while T5 and _some_ T8 use
> a closer spacing. Best to measure the spacing on you fluorescent tubes
> before committing to a pile of LED tubes.
>
> HTH,
> Donald.
>
> On 2022-01-11 11:44 a.m., Bob Spidell wrote:
>> I thought I had it figured out, but what's the difference in designation
>> between older tubes with 2 small prongs on one end, and the newer style
>> with one fat prong? It seems they're both called 'TX,' with 'X' being 8,
>> 12, etc.
>>
>> https://www.amazon.com/gp/product/B074M8KCJ1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
>>
>> vs.
>>
>> https://www.amazon.com/gp/product/B074MC1FW3/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1
>>
>>
>>
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